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Custom Liquibase Ant tasks for fast database migration
/*
* Copyright 2005-2007 The Kuali Foundation
*
*
* Licensed under the Educational Community License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.opensource.org/licenses/ecl2.php
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.kualigan.tools.ant.tasks;
import java.io.PrintStream;
import java.io.Reader;
import java.lang.reflect.Field;
import java.sql.Blob;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.DatabaseMetaData;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Observable;
import java.util.Observer;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.DirectoryScanner;
import org.apache.tools.ant.Main;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.types.FileSet;
import static org.apache.tools.ant.Project.MSG_DEBUG;
/**
*
* @author Leo Przybylski ([email protected])
*/
public class MigrateData extends Task {
private static final String[] carr = new String[] {"|", "\\", "-", "/"};
private static final String RECORD_COUNT_QUERY = "select count(*) as \"COUNT\" from %s";
private static final String SELECT_ALL_QUERY = "select * from %s";
private static final String INSERT_STATEMENT = "insert into %s (%s) values (%s)";
private static final String DATE_CONVERSION = "TO_DATE('%s', 'YYYYMMDDHH24MISS')";
private static final String COUNT_FIELD = "COUNT";
private static final String LIQUIBASE_TABLE = "DATABASECHANGELOG";
private static final int[] QUOTED_TYPES =
new int[] {Types.CHAR, Types.VARCHAR, Types.TIME, Types.LONGVARCHAR, Types.DATE, Types.TIMESTAMP};
private static final String HSQLDB_PUBLIC = "PUBLIC";
private static final int MAX_THREADS = 3;
private String source;
private String target;
private int threadCount;
public MigrateData() {
int threadCount = 1;
}
public void setSource(String refid) {
this.source = refid;
}
public String getSource() {
return this.source;
}
public void setTarget(String refid) {
this.target = refid;
}
public String getTarget() {
return this.target;
}
public void execute() {
final RdbmsConfig source = (RdbmsConfig) getProject().getReference(getSource());
final RdbmsConfig target = (RdbmsConfig) getProject().getReference(getTarget());
log("Migrating data from " + source.getUrl() + " to " + target.getUrl());
final Incrementor recordCountIncrementor = new Incrementor();
final Map tableData = getTableData(source, target, recordCountIncrementor);
log("Copying " + tableData.size() + " tables");
float recordVisitor = 0;
final ProgressObserver progressObserver = new ProgressObserver(recordCountIncrementor.getValue(),
48f, 48f/100,
"\r|%s[%s] %3d%% (%d/%d) records");
final ProgressObservable observable = new ProgressObservable();
observable.addObserver(progressObserver);
final ThreadGroup tgroup = new ThreadGroup("Migration Threads");
for (final String tableName : tableData.keySet()) {
debug("Migrating table " + tableName + " with " + tableData.get(tableName) + " records");
/*
if (tgroup.activeCount() < MAX_THREADS) {
new Thread(tgroup, new Runnable() {
public void run() {
migrate(source, target, tableName, observable);
}
}).start();
}
else {
*/
final Map columns = new HashMap();
migrate(source, target, tableName, observable);
// }
}
// Wait for other threads to finish
try {
while(tgroup.activeCount() > 0) {
Thread.sleep(5000);
}
}
catch (InterruptedException e) {
}
try {
final Connection targetDb = openConnection(target);
if (targetDb.getMetaData().getDriverName().toLowerCase().contains("hsqldb")) {
Statement st = targetDb.createStatement();
st.execute("CHECKPOINT");
st.close();
}
targetDb.close();
}
catch (Exception e) {
throw new BuildException(e);
}
}
protected void migrate(final RdbmsConfig source,
final RdbmsConfig target,
final String tableName,
final ProgressObservable observable) {
final Connection sourceDb = openConnection(source);
final Connection targetDb = openConnection(target);
source.setConnection(sourceDb);
target.setConnection(targetDb);
final Map columns = getColumnMap(source, target, tableName);
if (columns.size() < 1) {
log("Columns are empty for " + tableName);
return;
}
PreparedStatement toStatement = prepareStatement(targetDb, tableName, columns);
Statement fromStatement = null;
final boolean hasClob = columns.values().contains(Types.CLOB);
int recordsLost = 0;
try {
fromStatement = sourceDb.createStatement();
final ResultSet results = fromStatement.executeQuery(String.format(SELECT_ALL_QUERY, tableName));
try {
while (results.next()) {
try {
toStatement.clearParameters();
int i = 1;
for (String columnName : columns.keySet()) {
final Object value = results.getObject(columnName);
if (value != null) {
try {
handleLob(toStatement, value, i);
}
catch (Exception e) {
System.err.println(String.format("Error processing %s.%s %s", tableName, columnName, columns.get(columnName)));
if (Clob.class.isAssignableFrom(value.getClass())) {
System.err.println("Got exception trying to insert CLOB with length" + ((Clob) value).length());
}
e.printStackTrace();
}
}
else {
toStatement.setObject(i,value);
}
i++;
}
boolean retry = true;
int retry_count = 0;
while(retry) {
try {
toStatement.execute();
retry = false;
}
catch (SQLException sqle) {
retry = false;
if (sqle.getMessage().contains("ORA-00942")) {
log("Couldn't find " + tableName);
log("Tried insert statement " + getStatementBuffer(tableName, columns));
// sqle.printStackTrace();
}
else if (sqle.getMessage().contains("ORA-12519")) {
retry = true;
log("Tried insert statement " + getStatementBuffer(tableName, columns));
sqle.printStackTrace();
}
else if (sqle.getMessage().contains("IN or OUT")) {
log("Column count was " + columns.keySet().size());
}
else if (sqle.getMessage().contains("Error reading")) {
if (retry_count > 5) {
log("Tried insert statement " + getStatementBuffer(tableName, columns));
retry = false;
}
retry_count++;
}
else {
sqle.printStackTrace();
}
}
}
}
catch (Exception e) {
recordsLost++;
throw e;
}
finally {
observable.incrementRecord();
}
}
}
finally {
if (results != null) {
try {
results.close();
}
catch(Exception e) {
}
}
}
}
catch (Exception e) {
throw new BuildException(e);
}
finally {
if (sourceDb != null) {
try {
if (sourceDb.getMetaData().getDriverName().toLowerCase().contains("hsqldb")) {
Statement st = sourceDb.createStatement();
st.execute("CHECKPOINT");
st.close();
}
fromStatement.close();
sourceDb.close();
}
catch (Exception e) {
}
}
if (targetDb != null) {
try {
targetDb.commit();
if (targetDb.getMetaData().getDriverName().toLowerCase().contains("hsql")) {
Statement st = targetDb.createStatement();
st.execute("CHECKPOINT");
st.close();
}
toStatement.close();
targetDb.close();
}
catch (Exception e) {
log("Error closing database connection");
e.printStackTrace();
}
}
debug("Lost " +recordsLost + " records");
columns.clear();
}
}
protected void handleLob(final PreparedStatement toStatement, final Object value, final int i) throws SQLException {
if (Clob.class.isAssignableFrom(value.getClass())) {
toStatement.setAsciiStream(i, ((Clob) value).getAsciiStream(), ((Clob) value).length());
}
else if (Blob.class.isAssignableFrom(value.getClass())) {
toStatement.setBinaryStream(i, ((Blob) value).getBinaryStream(), ((Blob) value).length());
}
else {
toStatement.setObject(i,value);
}
}
protected PreparedStatement prepareStatement(Connection conn, String tableName, Map columns) {
final String statement = getStatementBuffer(tableName, columns);
try {
return conn.prepareStatement(statement);
}
catch (Exception e) {
throw new BuildException(e);
}
}
private String getStatementBuffer(String tableName, Map columns) {
String retval = null;
final StringBuilder names = new StringBuilder();
final StringBuilder values = new StringBuilder();
for (String columnName : columns.keySet()) {
names.append(columnName).append(",");
values.append("?,");
}
names.setLength(names.length() - 1);
values.setLength(values.length() - 1);
retval = String.format(INSERT_STATEMENT, tableName, names, values);
return retval;
}
protected boolean isValidTable(final DatabaseMetaData metadata, final String tableName) {
return !(tableName.startsWith("BIN$") || tableName.toUpperCase().startsWith(LIQUIBASE_TABLE) || isSequence(metadata, tableName));
}
protected boolean isSequence(final DatabaseMetaData metadata, final String tableName) {
final RdbmsConfig source = (RdbmsConfig) getProject().getReference(getSource());
try {
final ResultSet rs = metadata.getColumns(null, source.getSchema(), tableName, null);
int columnCount = 0;
boolean hasId = false;
try {
while (rs.next()) {
columnCount++;
if ("yes".equalsIgnoreCase(rs.getString("IS_AUTOINCREMENT"))) {
hasId = true;
}
}
}
finally {
if (rs != null) {
try {
rs.close();
}
catch (Exception e) {
}
}
return (columnCount == 1 && hasId);
}
}
catch (Exception e) {
return false;
}
}
/**
* Get a list of table names available mapped to row counts
*/
protected Map getTableData(RdbmsConfig source, RdbmsConfig target, Incrementor incrementor) {
Connection sourceConn = openConnection(source);
Connection targetConn = openConnection(target);
final Map retval = new HashMap();
final Collection toRemove = new ArrayList();
debug("Looking up table names");
try {
final DatabaseMetaData metadata = sourceConn.getMetaData();
final ResultSet tableResults = metadata.getTables(sourceConn.getCatalog(), source.getSchema(), null, new String[] { "TABLE" });
while (tableResults.next()) {
final String tableName = tableResults.getString("TABLE_NAME");
if (!isValidTable(metadata, tableName)) {
continue;
}
if (tableName.toUpperCase().startsWith(LIQUIBASE_TABLE)) continue;
final int rowCount = getTableRecordCount(sourceConn, tableName);
if (rowCount < 1) { // no point in going through tables with no data
}
incrementor.increment(rowCount);
debug("Adding table " + tableName);
retval.put(tableName, rowCount);
}
tableResults.close();
}
catch (Exception e) {
throw new BuildException(e);
}
finally {
if (sourceConn != null) {
try {
sourceConn.close();
sourceConn = null;
}
catch (Exception e) {
}
}
}
try {
for (String tableName : retval.keySet()) {
final ResultSet tableResults = targetConn.getMetaData().getTables(targetConn.getCatalog(), target.getSchema(), null, new String[] { "TABLE" });
if (!tableResults.next()) {
log("Removing " + tableName);
toRemove.add(tableName);
}
tableResults.close();
}
}
catch (Exception e) {
throw new BuildException(e);
}
finally {
if (targetConn != null) {
try {
targetConn.close();
targetConn = null;
}
catch (Exception e) {
}
}
}
for (String tableName : toRemove) {
retval.remove(tableName);
}
return retval;
}
private Map getColumnMap(final RdbmsConfig source, final RdbmsConfig target, String tableName) {
final Connection targetDb = target.getConnection();
final Connection sourceDb = source.getConnection();
final Map retval = new HashMap();
final Collection toRemove = new ArrayList();
try {
final Statement state = targetDb.createStatement();
final ResultSet altResults = state.executeQuery("select * from " + tableName + " where 1 = 0");
final ResultSetMetaData metadata = altResults.getMetaData();
for (int i = 1; i <= metadata.getColumnCount(); i++) {
retval.put(metadata.getColumnName(i),
metadata.getColumnType(i));
}
altResults.close();
state.close();
}
catch (Exception e) {
throw new BuildException(e);
}
for (final String column : retval.keySet()) {
try {
final Statement state = targetDb.createStatement();
final ResultSet altResults = state.executeQuery("select * from " + tableName + " where 1 = 0");
final ResultSetMetaData metadata = altResults.getMetaData();
for (int i = 1; i <= metadata.getColumnCount(); i++) {
retval.put(metadata.getColumnName(i),
metadata.getColumnType(i));
}
altResults.close();
state.close();
}
catch (Exception e) {
throw new BuildException(e);
}
}
for (final String column : toRemove) {
retval.remove(column);
}
return retval;
}
private int getTableRecordCount(Connection conn, String tableName) {
final String query = String.format(RECORD_COUNT_QUERY, tableName);
Statement statement = null;
try {
statement = conn.createStatement();
final ResultSet results = statement.executeQuery(query);
results.next();
final int retval = results.getInt(COUNT_FIELD);
results.close();
return retval;
}
catch (Exception e) {
if (e.getMessage().contains("ORA-00942")) {
log("Couldn't find " + tableName);
log("Tried insert statement " + query);
}
log("Exception executing " + query);
throw new BuildException(e);
}
finally {
try {
if (statement != null) {
statement.close();
statement = null;
}
}
catch (Exception e) {
}
}
}
private void debug(String msg) {
log(msg, MSG_DEBUG);
}
private Connection openSource() {
return openConnection(getSource());
}
private Connection openTarget() {
return openConnection(getTarget());
}
private Connection openConnection(String reference) {
final RdbmsConfig config = (RdbmsConfig) getProject().getReference(reference);
return openConnection(config);
}
private Connection openConnection(RdbmsConfig config) {
Connection retval = null;
while (retval == null) {
try {
debug("Loading schema " + config.getSchema() + " at url " + config.getUrl());
Class.forName(config.getDriver());
retval = DriverManager.getConnection(config.getUrl(), config.getUsername(), config.getPassword());
retval.setAutoCommit(false);
// If this is an HSQLDB database, then we probably want to turn off logging for permformance
if (config.getDriver().indexOf("hsqldb") > -1) {
debug("Disabling hsqldb log");
final Statement st = retval.createStatement();
st.execute("SET FILES LOG FALSE");
st.close();
}
}
catch (Exception e) {
// throw new BuildException(e);
}
}
return retval;
}
/**
* Helper class for incrementing values
*/
private class Incrementor {
private int value;
public Incrementor() {
value = 0;
}
public int getValue() {
return value;
}
public void increment() {
value++;
}
public void increment(int by) {
value += by;
}
}
private class ProgressObservable extends Observable {
public void incrementRecord() {
setChanged();
notifyObservers();
clearChanged();
}
}
/**
* Observer for handling progress
*
*/
private class ProgressObserver implements Observer {
private float total;
private float progress;
private float length;
private float ratio;
private String template;
private float count;
private PrintStream out;
public ProgressObserver(final float total,
final float length,
final float ratio,
final String template) {
this.total = total;
this.template = template;
this.ratio = ratio;
this.length = length;
this.count = 0;
try {
final Field field = Main.class.getDeclaredField("out");
field.setAccessible(true);
out = (PrintStream) field.get(null);
}
catch (Exception e) {
e.printStackTrace();
}
}
public synchronized void update(Observable o, Object arg) {
count++;
final int percent = (int) ((count / total) * 100f);
final int progress = (int) ((count / total) * (100f * ratio));
final StringBuilder progressBuffer = new StringBuilder();
for (int x = 0; x < progress; x++) {
progressBuffer.append('=');
}
for (int x = progress; x < length; x++) {
progressBuffer.append(' ');
}
int roll = (int) (count / (total / 1000));
if (getProject().getProperty("run_from_ant") == null) {
out.print(String.format(template, progressBuffer, carr[roll % carr.length], percent, (int) count, (int) total));
}
else if ((count % 5000) == 0 || count == total) {
out.println(String.format("(%s)%% %s of %s records", (int) ((count / total) * 100), (int) count, (int) total));
}
}
}
}